#19 Postby Extratropical94 » Thu Mar 31, 2011 3:25 pm
IDD20020
TROPICAL CYCLONE TECHNICAL BULLETIN: AUSTRALIA - NORTHERN REGION
Issued by DARWIN TROPICAL CYCLONE WARNING CENTRE
at: 1959 UTC 31/03/2011
Name: Tropical Low
Identifier: 25U
Data At: 1800 UTC
Latitude: 12.4S
Longitude: 130.4E
Location Accuracy: within 60 nm [110 km]
Movement Towards: west southwest [243 deg]
Speed of Movement: 4 knots [8 km/h]
Maximum 10-Minute Wind: 25 knots [45 km/h]
Maximum 3-Second Wind Gust: 45 knots [85 km/h]
Central Pressure: 999 hPa
Radius of 34-knot winds NE quadrant:
Radius of 34-knot winds SE quadrant:
Radius of 34-knot winds SW quadrant:
Radius of 34-knot winds NW quadrant:
Radius of 48-knot winds NE quadrant:
Radius of 48-knot winds SE quadrant:
Radius of 48-knot winds SW quadrant:
Radius of 48-knot winds NW quadrant:
Radius of 64-knot winds:
Radius of Maximum Winds:
Dvorak Intensity Code: T1.5/1.5/D1.0/24HRS
Pressure of outermost isobar: 1002 hPa
Radius of outermost closed isobar:
Storm Depth:
FORECAST DATA
Date/Time : Location : Loc. Accuracy: Max Wind : Central Pressure
[UTC] : degrees : nm [km]: knots[km/h]: hPa
+12: 01/0600: 12.7S 129.3E: 090 [165]: 025 [045]: 999
+24: 01/1800: 13.4S 128.5E: 120 [220]: 030 [055]: 997
+36: 02/0600: 14.2S 126.8E: 150 [280]: 040 [075]: 992
+48: 02/1800: 14.5S 125.2E: 185 [345]: 040 [075]: 992
+60: 03/0600: 15.0S 123.7E: 230 [430]: 045 [085]: 989
+72: 03/1800: 15.8S 122.5E: 280 [520]: 050 [095]: 986
REMARKS:
Circulation centre has been hard to locate, with possible multiple centres, and
a mid-level circulation associated with convection to the west of the Tiwi
Islands. Analysed centre has been located with radar feature west of the Cox
Peninsula, which is most consistent with surface observations.
There have been a number of convective blow-ups overnight in the Timor Sea,
including deep convection associated with the Cox Peninsula centre. Dvorak
analysis on this feature yields DT of 1.5 from 0.25 wrap curved band. MET/PT
agree. Environment remains suitable for development apart from moderate NW
vertical wind shear over the area, and expectation is for development at
standard rate, which would indicated TC development on Saturday morning over the
Timor Sea.
Mid-level steering is dominated by ridging to the southwest and east, with a
weak trough over central NT. The ridge to the southwest is forecast to
strengthen producing a forecast track towards the southwest, passing close to
the northwest Kimberley coast during Saturday.
Copyright Commonwealth of Australia
==
The next bulletin for this system will be issued by: 01/0130 UTC by Darwin TCWC.
0 likes